基于单端口耦合等值的配电网静态电压稳定指标分析及应用  

Analysis and Application of Static Voltage Stability Indices for Distribution Network Based on Single-port Coupling Equivalence

作　　者：吴志[1] 李广焕 张小平[3] 郑舒 周苏洋 WU Zhi;LI Guanghuan;ZHANG Xiaoping;ZHENG Shu;ZHOU Suyang(School of Electrical Engineering,Southeast University,Nanjing 210096,China;School of New Energy,China University of Petroleum,Qingdao 266580,China;Department of Electronic,Electrical and Systems Engineering,University of Birmingham,Birmingham B152TT,UK)

机构地区：[1]东南大学电气工程学院,江苏省南京市210096 [2]中国石油大学(华东)新能源学院,山东省青岛市266580 [3]英国伯明翰大学电子电气及系统工程系,伯明翰B152TT,英国

出　　处：《电力系统自动化》2023年第23期44-54,共11页Automation of Electric Power Systems

基　　金：国家电网公司科技项目(5400-202219417A-2-0-ZN)。

摘　　要：随着配电网中光伏渗透率不断上升,源网荷关联效应持续增强,使得配电网电压稳定性分析困难。对此,文中依据节点电压方程建立了单端口耦合等值电路,主要包括3个部分:电源(主网供电、分布式电源)、负荷以及二者间耦合的关系。考虑到配电网多节点、多线路对电压稳定性的耦合影响,基于单端口耦合等值电路潮流可解性提出了耦合电压稳定指标(CVSI),并对配电网静态电压稳定性进行量化分析。针对传统静态电压稳定指标往往高度非线性,难以应用于配电网优化运行,文中基于二阶锥最优潮流模型对CVSI进行简化,并结合EPSILON约束法将配电网运行优化模型转化为多目标混合整数优化模型,提出了基于多目标函数综合最优原则的帕累托前沿最优解求解方法。最后,对中国浙江省台州市某实际配电网模型进行算例分析,验证了指标及模型的有效性。With the increasing penetration of photovoltaic in distribution networks,the source-grid-load correlation effect continues to increase,which increases the difficulty in analyzing the voltage stability of distribution networks.In this regard,this paper establishes a single-port coupling equivalent circuit based on the bus-voltage equation,which mainly includes three parts,i.e.,power(main grid power supply,distributed generator),load,and the coupling relationship between them.Considering the coupling effect of multiple buses and lines on the voltage stability in distribution networks,the coupled voltage stability index(CVSI)is proposed based on the power flow solvability of the single-port coupling equivalent circuit,and the static voltage stability of distribution networks is quantitatively analyzed.In view of the fact that the traditional static voltage stability index is often highly nonlinear and difficult to apply to the optimization of distribution network operation,this paper simplifies the CVSI based on the second-order conical optimal power flow model and combines it with the EPSILON constraint method to transform the optimization model of distribution network operation into a multi-objective mixed-integer optimization model,and puts forward an optimal solution method of the Pareto frontier based on the principle of the comprehensive optimization of the multi-objective function.Finally,a real distribution network model in Taizhou City,Zhejiang Province,China,is analyzed as a case to verify the validity of the indexes and the model.

关 键 词：配电网 静态电压稳定 EPSILON约束法 多目标优化 二阶锥松弛 

分 类 号：TM712[电气工程—电力系统及自动化]